Compound-screw-power device



` H."R. BREMER coMPoUND scREw POWER' DEVICE Filed Dec. 18. 1922 Patented Nov. 17,

UNITED sTATEs PATENT OFFICE.

HENRY R. IBREMEB, 0F KANSAS CITY, MISSOURI.

coMroUNn-scaEW-Pownn nnvron.

.application filed December 18, 1922. Serial No. 607,617.

screw power device and has for its object to produce mechanism whereby the power produced by the reciprocation of a piston may be transferred and imparted through a screw, the resulting torce being greater than if the force of the piston was transmitted directly as reciprocating motion.lv It is well known in mechanics that power transmitted through a screw is increased in proportion to the distance travelled by the actuating force in comparison with the distance travelled by the screw, and the chief object of this-invention is to take advantage of this fact, and to produce a- 4mechanism whereby such a result may be attained in a small and relatively compact mechanism.

With the object named in view, the invention consists in certain novel and useful features of con-struction and organization of parts as hereinafter described and claimed; and in order that it may be fully understood, reference is to be had to the accompanying drawing, in which: p

Figure 1 is va face view of a mechanism embodying the invention as it will appear in use, and which for convenience is illustrated as used in conjunction with a punch;

Fi re 2 is a section taken on the line II of Flgure 1; i

Figure 3v is `a vsection taken on the line IIL-IH of Figure 2;

lFi re 4 is a section on 'the line IV-IV of Figure 2; and

Figure 5 is a reduced sectional view taken through the piston and cylinder to illustrate certain piston ports.

In the said drawing, where like-reference i characters identify correspondingl parts in with a handle 6, said handle being formed allof the gures, 1 illustrates a cylinder, to the lower end of which is secured a base portion' 2, terminating in a foot 3 formed with an opening for the reception of any' `common or well-known type or female die 4.

Bolted or otherwisev secured to the upper end of the cylinder-is a cap member 5`forrned with a pair o'f bores Aor passages 7 and 8,-,for

land 13 respectively, at their lower ends.

-nels 13 and 13a respectively, are a pair of the reception of slide valves 9 and 10, and vertically above said valves 9 and 10 are a pair of horizontal fluid passage-ways 11 and 11, the passageeway 11 being in communication with the atmosphere at one of its ends, and the passage-way 11x1 is in communication with a suitable source of fluid supply under pressure (not shown).

Communicating with the bores and 8 near their opposite ends and extending vertically downward are passage-ways 12a and 12, respectively, each-pair of passage-ways being united by horizontal passage-ways 13 Upon referringto Figurea, it will be found that the bores 7 and 8 are of .unequal length, the former being somewhat vlonger than the latter, and that, therefore, the valvesy 9 and 10 are of unequal length, the former being the longer, and said valve 9 is provided near its opposite ends with openings 15 which at certain times are adapted to permitof communication between vthe passage-ways 11a and 12a and 11 and 12; and that the valve 10 is formed with a single opening 16, which is at times adapted to permit of communication between the passage-ways 11 and 12, at which time the opposite end of said piston will close communication in the other end'of the handle between passage-ways 11 and 12, as will be readily understood, upon an inspection of the drawing, (more particularly Figure'll). Pivoted to the handle at any convenient point is a control trigger 17, adapted to force the valves 9 and 10 inwardly, said valves and handle being returned tonormal position by means of coiled springs 18 pressing at one o their ends against the device and at their opposite ends against suitable collars pinned or otherwise securely fixed in the extremities of the valves.

In communication with the cross chanvertical passage-ways 19 and 20, formed in the side walls of the cylinder, theformer terminating in an upturned portion 21 and the latter in a downwardly .angling portion 22, and each communicating with the interior o the cylinder 1.

Extending through the cylinder 1 isa piston rod 23 formed at its upper end with a bearing portion 24 slidingly received within a socket formed in the'cap 5. The iston rod is formed with a double spiral t read 25 of rather 'great pitch and preferably formed with straight walls, and extends downwardly through the base 2, and has threaded engagement with said base as at 26, the threads in this instance being ot' relatively small pitch as compared with the threads 25. It will be apparent from the construction just-described, when rotation is imparted to the rod, that the threads 2G will feed the rod downwardly, and in order to accommodate this downward movement, the base is formed with an enlarged chamber 27 into which the lower portion of threads 26 will be received.

The lower end of the piston rod is provided with a suitable bearing collar 28 fixedly secured to the base, and clamped between said base and collar is a packing 29 of any suitable or desired character. The lower end of the rod is connected to a coupling 30 of any suitable character, and carried by said coupling is a punch bit 31, in the device as illustrated. The drawing indicates a bit which ceases to rotate immediately'the bit comes into contact with the work, but it will be readily understood, that if found desirable, a bit which rotates may be employed. 4

'Threaded on the rod 23 is a piston 32 provided with piston rings 34 as common,

and also provided at its opposite sides with a pair of tongues 34, for holding the piston against rotation, projecting from the piston and adapted for travel within a pair of channels 35 formed in the opposite walls of b the cylinder, see Figure 3. `The piston is also provided with ports 37 and 38 adapted for communication respectively, with the ports 21 and 22. 1 i The operation of the device is as follows: With the parts standing in the 4position shown in Figure 2,-luid under pressure is permitted to enter the passage-way 11* and it immediately passes downwardly through the opening 15 of the valve 9, the passageway 12 and into the cross passage-way 13a and down through passage-way 19 and exits through the port 21 into the port 37 ofthe piston which, at this time is in registerwith the port 21, and thus into the cylinder above the piston.

Pressure is thus imposed on top of the piston and forces it downward. As the piston is held against rotation, as above-described, its threaded engagement with the rod will impart rotary movement to the latter, and with the proportions illustrated, the rod is revolved one complete revolution in the course ot' travel ot' the piston, and this rotary movement of the piston causes it to be ted downwardly by the threads26 .in engagement with the base, as will be readily understood. Just prior to the time the piston attains its limit of travel, a Huid cushion is interposed between it and the lower end of the cylinder, as will be described in connection with the upward travel of the piston.

During the entire downward movement of the piston, except for the short time that the cushion is created, the lower end of the cylinder is in communication with the portr passage (see .Figure 4), 11 and thus to the atmosthe cylinder in communication with the atn'iosphere through the port 21, passage 19, passage 13passage 12, the opening 1G in the valve 1t), and thus to the passage 11 and the atmosphere; and at the same time opening 15 in the valve 9 places the passage 11a in communication with the passage 12a, passage 13a, passage 20, port 22 and port 38 of the piston. The piston isnow driven 'upwardly as will be readily understood, and during its upward movement, of course, returns the rod to its original position for further operation.

Referring tov Figure 5, it will be foundl the parts areso proportioned that on each reciproca-tion of the piston at both ends of its stroke a small quantity of Huid is trapped by the end of the piston cutting otf port 21 efore piston port 37 or 38 registers respectively with ports 21 or 22. This trapped material provides a iuid cushion as is welllcnown in the art, and the trapped Huid will escape when lthe' iston movement brings the ports 37 andl 21 er 38 and 22 into communication.

It will be apparent from the abovepdeseription that 'the same gene-ral construction may be employed for a number of different purposes, and while I have described and claimed the preferred embodiment of the invention, it is to be understood that I reserve the right to make all changes properlyfalling within the spirit and scope of the appended claims.l

What I claim is:

1. In a power device, a threaded support, a rod having two threads of different pitch, that of the lesser pitch engaging the thread ot' the support, and means for movement on the rod and engaging the threaded portion of greater pitch to impart rotation to said rod which is consequently moved longitudinally by its threaded portion in engagement with the support. I

2. In a power device, a threaded support, a rod having two threads of different pitch, that of the lesser pitch engaging the thread of the support, means for movement on the rod and engaging the threaded portion of greater pitch to impart rotation to said rod which is consequently moved longitudinally by its threaded rortion in engagement with the support, and slidable means for actuation by the endwise movement of the rod.

3. In a power device, a threaded support,

a rod having two threads of different pitch,

that of the lesser pitch engaging the thread of the support, means for mo-vement on the rod and engaging the threaded portion of greater pitch to impart rotation to said rod which is consequently moved longitudinally by its threaded portion in engagement wit the support, and a punch swivelled to one end of the rod.

4. In a power device, a support having 'a threaded bore and a piston cylinder at one end of saidbore, a rod extending through said cylinder and journaled at one end in the support and having a thread engaging the threaded bore and al second thread within the cylinder, a piston for reciprocatio-n within the cylinder longitudinally of the rod, and engaging the said second thread thereof and interlocked with the cylinder against rotation.

5. In a power device, a support having a threaded bore and a piston cylinder at one end of said bore, a rod extending through said cylinder and journaled at one end in the support and having a thread engaging the threaded bore and a second thread within the cylinder, a piston for reciprocation Within the cylinder longitudinally of and .of threads vbeing in engagement with the threaded bore, and a piston for reciprocation within the cylinder and having threaded engagement with said second set of threads rand interlocked with the cylinder to prevent rotation.

7. In a power device, a support having a threaded bore vand a piston cylinder" at one end of said bore, a rod `extending through said cylinder and journaled at one end in the support and having a set of right and a set of left hand threads, one of said sets f of threads being in engagement with the threaded bore, a piston interlocked with the cylinder for reciprocation `within the cylinder and having threaded engagement with said second set of threads, and means for controlling the admission of fluid under pressure to either end of said cylinder.

In witness whereof I hereunto affix my signature.

HENRY It. BREMER. 

